SiC particle(SiCp)/Al composite materials were fabricated via powder packed resistance seam welding additive manufacturing.The influence of welding speed on microstructure and mechanical properties of the specimen was...SiC particle(SiCp)/Al composite materials were fabricated via powder packed resistance seam welding additive manufacturing.The influence of welding speed on microstructure and mechanical properties of the specimen was investigated,elucidating the formation and fracture mechanism of single-pass multi-layer deposition.The results demonstrate that a dense internal structure of the specimen characterized by uniformly dispersed SiCp embedded within the Al matrix is formed.However,particle agglomeration and porosity defects are observed.The porosity increases with the increase in welding speed,and the microstructure of the RSAM-24 specimen has the highest density,characterized by a density of 2.706 g/cm^(3)and a porosity of 1.672%.The mechanical properties of the specimens decrease as the welding speed increases.Optimal mechanical properties are obtained when the welding speed is set as 24 cm/min.Specifically,the average hardness,tensile strength and elongation values are 463.736 MPa,52.16 MPa and 2.2%,respectively.The tensile specimens predominantly exhibit fracture along the interlayer bonding interface and the interface between the Al matrix and SiC particles,and the damage mode is ductile fracture.展开更多
Clinical Practice Guideline on Acupuncture and Moxibustion:Migraine(WFAS 007.9-2023)is a clinical practice guideline officially released by the World Federation of Acupuncture-Moxibustion Societies(WFAS)on October 9,2...Clinical Practice Guideline on Acupuncture and Moxibustion:Migraine(WFAS 007.9-2023)is a clinical practice guideline officially released by the World Federation of Acupuncture-Moxibustion Societies(WFAS)on October 9,2023,and is the first international guideline on the treatment of migraine with acupuncture.This international standard was developed under the guidance of rigorous evidence-based methodology,and it contains guideline purpose,scope,applicable population,applicable settings,overview of acupuncture for migraine,guideline development process and recommendations.For promoting the understanding and application of this guideline,this article summarizes a total of 18 recommendations in order to assist clinical decisions for migraine with acupuncture.展开更多
基金National Natural Science Foundation of China(52205375)Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province(20204BCJ23003)Jiangxi Provincial Natural Science Foundation(20224BAB214010,20232BAB204049,jxsq2019201118)。
文摘SiC particle(SiCp)/Al composite materials were fabricated via powder packed resistance seam welding additive manufacturing.The influence of welding speed on microstructure and mechanical properties of the specimen was investigated,elucidating the formation and fracture mechanism of single-pass multi-layer deposition.The results demonstrate that a dense internal structure of the specimen characterized by uniformly dispersed SiCp embedded within the Al matrix is formed.However,particle agglomeration and porosity defects are observed.The porosity increases with the increase in welding speed,and the microstructure of the RSAM-24 specimen has the highest density,characterized by a density of 2.706 g/cm^(3)and a porosity of 1.672%.The mechanical properties of the specimens decrease as the welding speed increases.Optimal mechanical properties are obtained when the welding speed is set as 24 cm/min.Specifically,the average hardness,tensile strength and elongation values are 463.736 MPa,52.16 MPa and 2.2%,respectively.The tensile specimens predominantly exhibit fracture along the interlayer bonding interface and the interface between the Al matrix and SiC particles,and the damage mode is ductile fracture.
基金Supported by National Key Research and Development Program of China:2019YFC1712200,2019YFC1712203Independent Project of the Institute of Acupuncture and moxibustion,China Academy of Chinese Medical Sciences:ZZ202219004Science and technology innovation project of China Academy of Chinese Medical Sciences:CI2020A03510。
文摘Clinical Practice Guideline on Acupuncture and Moxibustion:Migraine(WFAS 007.9-2023)is a clinical practice guideline officially released by the World Federation of Acupuncture-Moxibustion Societies(WFAS)on October 9,2023,and is the first international guideline on the treatment of migraine with acupuncture.This international standard was developed under the guidance of rigorous evidence-based methodology,and it contains guideline purpose,scope,applicable population,applicable settings,overview of acupuncture for migraine,guideline development process and recommendations.For promoting the understanding and application of this guideline,this article summarizes a total of 18 recommendations in order to assist clinical decisions for migraine with acupuncture.
